Tube-making apparatus



May 22, 192s. 1,670,445

. J. R. GAMMETER TUBE MAKING APPARATUS original Filed Aug. S, 1925 LAW aan@ May 22, 1928.1 l

l j '1,610,445 UNITED-STATES PATENT. OFFICE.

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riginal lineman mangas: a, 192s, semi la.

47,690; "ratez-1t No. 1,663,754, ama umn-21, lass.

Divided and this application led lNovember- '18, 1928. Serial lo; 119,119.

This invention relates to apparatus for aking tubes and especially rubber tubes ich as inner tubes'for tires.' The resent iplication .is a division ofA my vapp ieaton er. No. 47,690,1iled August 3, 1 Patlt No. 1,663,754, March 27 1928, in which claim a tube such as readily may be made y. the use of this apparatus, and t e metlrod makin the tube. TheL chief object of the present invention to provide improved apparatus ada ted r economy of Atime and abor in m 'ng ibes such as rubber inner tubes for tires. 0f the. accompanying drawings: Fi 1 i's a perspective view of a tubelil ing drum embodying my invention, ith the work inV lace thereon.' Fig; 2 is a side e evation :of the mme,.at a ter stage of operation, -parts being secnned and broken: away. F' 3 is a section of a id t e work thereon at a ater stage. Fi 4 is a side elevation .of the same at a ill later stage of o ration. Referring to the wings, the apparatus mprises a drum 10 adapted yto be mounted r' rotation andhaving upon its outer face n annular band 1 1 of flexible elastic, nonihesive material such` as vu rubr, this band preferably being `formed with middlel rib 12 ou its inner face, setinto groove onthe surface of the drum, so as maintain 'the band properly centered upon e drum. i' In the 'practice of my method in its prerred form, a strip 131 of calendered stock drawn from asource of sup 1yv such as .aE lander` and wound u n the 110 over e band 11, being given such Icalform'that'them ofeacli turn the material are oE-s'et frankY entially of the drum as that ofthe leading e or mon, omo, assIGNon :ro TBE s. rf. eoonmcrr contraint, o r maw You, N. Y., a `conroua'rlou or NEW toux.

end 13,l of the winding, and the residue 13" of the stock strip sembly.

A valve stempatch -15 is then mounted upon thelmargin of the'winding at which to which the. valve stem pad is attached, is .treated with a wash consisting of ahighly volatile liquid containing a suitable sub-y stance in solut-ion or suspension \to prevent is freed from the ,'drum asadhesion of the rubbery when the .solventi evaporates, which occurs quickl .because of the warm/condition of the stoc when it is t 'fdrawn directly from the calender. A suitart of the drum which may be super-saturated, of stearic ablewash for this purpose is a solution,

acid in'alcohol. The wash readilly1 applied by means of a paint brus 2, eld against `the work while the drum 1s rotated. A

After lthe solventhas evaporated, -the margin 16, u n which the valve s tem patch is mounted, 1s.progressively turned over to approximatel the middle line of the as`- sembly, toget er with the adjacent `margin .of the non-adhesive underlying band 11,

which. ma be readily accomplished b rotatf ingethe rum and manipulating t e said margins with a suitable turning tool, as will blt: readily understood by thoseskilled in t e art. l

The opposite margins of the band 11 and of the work 'are then similarly turned over `and the margins of the winding of the tacky `rubber strip 13 are progressively joined togather in the mis-inatched'intertted relation; which is clearly shown in Fig. 7 3. The

portion of the valve stem. patch 15 which projectsfrom the Imargin 16 contacts and 1s stuck to vthe inner face of the-inner. ply

'resulting tube, imaging the seam. The seam is then A com acted. by rotating the druin with the wor thereon while holding a roller 319y (Fig. 4') against the middle `por 1.00 "of the margin. 17 so thatv it lieswithin the' 'Y so thatfthef seam andvalve stem the lastwound ply overhangs the underlypatch are on its inner periphery, and is vulcahized under internal `fluid pressure such as to prevent contact and adhesion of its inner surfaces, and preferably in a mold, a valve stem preferably being inserted prior to the vulcanzation.

The method results in an improved longitudinally seamed tube of which the seams of the several plies are mis-matched, and having the same number of plies at all parts of the tube. The em loyment of the flexible band 11 permits t e tacky rubber plies to be turned over and joined without the employment .of other precaution against undesired adhesion thereof. l

Modifications may be employed within the scope of mv invention and I do not wholly limit my claims to the specific description herein .given by way of illustration.

I claim: 1. Tube-making apparatus comprising a aform adapted to support an annular band of tube-forming material and non-adhesive means thereon adapted to underlie the marginsv of a hand of tubeformn material mounted thereon and to he lifte form to fold over lsaid margins onto the middle ortion of the band.

2. Tu e-making apparatus comprising a cylindrical form and a band of flexible and non-adhesive material thereon having its middle portion anchored to the form and its annular marginal portions free to be folded over toward its middle portion.

3. Tube-makingI apparatus as defined in claim 2 in whichy the and of flexible material comprises an annulus of vulcanized rubber and is formed at its middle portion with an anchoring portion interlcked with the form against axial displacement.

In witness whereof'I have hereunto set my hand this 9th day of November, 1926.

JOHN R. GAMMETER.

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